Stuart Cook a038028eca
Rollup merge of #138024 - reitermarkus:unicode-panic-optimization, r=ibraheemdev
Allow optimizing out `panic_bounds_check` in Unicode checks.

Allow optimizing out `panic_bounds_check` in Unicode checks.

For context, see https://github.com/japaric/ufmt/issues/52#issuecomment-2699207241.
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The files here use the LLVM FileCheck framework, documented at https://llvm.org/docs/CommandGuide/FileCheck.html.

One extension worth noting is the use of revisions as custom prefixes for FileCheck. If your codegen test has different behavior based on the chosen target or different compiler flags that you want to exercise, you can use a revisions annotation, like so:

// revisions: aaa bbb
// [bbb] compile-flags: --flags-for-bbb

After specifying those variations, you can write different expected, or explicitly unexpected output by using <prefix>-SAME: and <prefix>-NOT:, like so:

// CHECK: expected code
// aaa-SAME: emitted-only-for-aaa
// aaa-NOT:                        emitted-only-for-bbb
// bbb-NOT:  emitted-only-for-aaa
// bbb-SAME:                       emitted-only-for-bbb